I assume you are talking about a hall effect sensor as opposed to an a/c pulse generator which most speed sensors are. HT is right in the fact you can't add different stuff on the the vehicles PCM, it's not expandable like a desktop or laptop pc.

I know that the PCM is only getting the information from the sensors, but I am wondering if I can connect and inductive speed sensor to the board computer? And for the second question, hall sensor's and inductive sensor's digital signal forms are different, but are there any other differences? I am making a final project for my college, a onboard computer imitation display, and I got these questions.

They are 2 completely different sensors, one generates a digital pattern the other a sine wave pattern, one generates it's own signal the other uses reference voltage. The a/c signal is very prone to outside interference.

You still haven't told us what it is you are trying to do.....

Any PCM is programmed to receive a series of inputs and based on those inputs will perform various outputs trying to keep the engine in fuel control and achieve the lowest possible emissions....

Those inputs (& outputs) will be listed as PIDs on a scan tool. That PCM is looking for a very speific signal, at a specific amplitude, at a specific time for each PID. If you go outside the box, the PCM doesn't like that and will possibly disable what ever circuit it's monitoring or at the very least turn on the service engine soon light....

I'm not sure what you are doing but you would probably have to engineer a flash for the PCM to be successful....at the very least.....

The board also has to have the circuitry, such as an A/D converter, when using analog sensors.

There is a lot more than just wiring up a sensor to a board. The board and of course the software has to be able to handle the type of sensor being used.

The VR sensors and PM generators produce their own voltages. A hall effect sensor needs a voltage source to operate. On most vehicles the power for the hall effect sensor comes from the computer itself.

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